During World War II, the United States experimented with glass pennies like this one. Copper was extremely scare, and extremely valuable for munitions, as gun ammunition casings and bullet jackets. In 1943 the US Mint tried making coins out of steel. Then out of glass.
But the problem was making glass coins – they kept cracking during production. The coin above is worth above $60,000 because so few glass coins have survived unbroken!
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